linux-kernel - Re: RCU_USER

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Message-ID: <20121005200030.GA1615@redhat.com>
Date:	Fri, 5 Oct 2012 16:00:30 -0400
From:	Dave Jones <davej@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: RCU_USER_QS traces.

On Fri, Oct 05, 2012 at 02:36:19PM +0200, Frederic Weisbecker wrote:
 > On Thu, Oct 04, 2012 at 10:41:06AM -0400, Dave Jones wrote:
 > >  > We have CONFIG_RCU_USER_QS that is a specific case. It's an intermediate state
 > >  > before we implement a true CONFIG_NO_HZ_FULL. But the option is useless on its
 > >  > own for users. Worse, it introduces a real overhead. OTOH we want it to be upstream
 > >  > to make the development of full tickless feature more incremental.
 > > 
 > > I couldn't resist trying it.. Did these get reported yet ?
 > 
 > Hi Dave,
 > 
 > Thanks for this report. I need to find the source of the issue.
 > 
 > If you don't mind, could you please apply the following patch? You'll also
 > need to enable:
 > 
 > - CONFIG_EVENT_TRACING and CONFIG_RCU_TRACE
 > 
 > And you also need this boot parameter:
 > 
 > - trace_event=rcu_dyntick
 > 
 > Thanks a lot!

Hrmph, it seems to have gone into hiding. I can't reproduce it any more.
If it shows about again, I'll get back to you.

	Dave 
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